Electric Power Engineering
Operational Planning of Electric Power
System with Multi-terminal VSC-HVDC
Ph.D. student: Wang Feng
Supervisor and Examiner: Prof. Lina Bertling
Co-supervisor: Tuan Le (Chalmers)
Anders Mannikoff (SP)
Anders Bergman (SP)
Financial support: Chalmers Energy Initiative (CEI)
Partners: Chalmers University of technology,
SP Technical Research Institute of Sweden
2011-12-02
Chalmers Energy Initiative
Electric Power Engineering
Outline
•
•
•
•
State-of-the-art of VSC-HVDC
– VSC Topologies
– Modeling and Control
Project examples
Potential applications
Summary from literature review
•
•
Example results
Further work
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
1
Electric Power Engineering
State-of-the-art of VSC HVDC:
VSC Topologies
Two Level Converter
Multi Level Converter
HalfBridge
Bridge
Full
MMC (Half Bridge)
Neutral Point Clamped
Two level
(NPC)
Converter
three level converter *
Modular Multilevel Converter (MMC) **
MMC (Full Bridge)
* A.R.Nabae,
I. Takahashi,
and
H. Akagi,Converter:
"A New Neutral-Point**
Marquardt,
"Modular
Multilevel
An universal
Clampedfor
PWM
Inverter," Industry
Applications,
IEEE Transactionsin
concept
HVDC-Networks
and extended
DC-Bus-applications,"
on, vol.Electronics
IA-17, pp. Conference
518-523, 1981.
Power
(IPEC), 2010 International, 2010.
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
2
Electric Power Engineering
State-of-the-art of VSC HVDC:
Modeling and Control
P+Resonant
controller
incontroller
stationary
*
Power-Synchronization
in frame
synchronous
frame **
Linear PI controller
in synchronous
frame
* Z.
**
R. Lidong,
Teodorescu,
L. Harnefors,
F. Blaabjerg,
and M.
H. P.
Liserre,
Nee, "Interconnection
and P. C. Loh, "Proportional-resonant
of Two Very Weak AC
controllers
Systems by
andVSC-HVDC
filters for gridLinks Using
Power-Synchronization
connected voltage-source
Control,"
converters,"
Power
Electric
Systems,
Power
IEEE
Applications,
Transactions
IEE
on,Proceedings
vol. 26, pp. -,
344-355,
vol. 153,2011.
pp. 750-762, 2006.
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
3
Electric Power Engineering
Example Projects
Project Name
Trans
South
Caprivi
Bay
West
Link,
Cable,
link,
Sweden/Norway
Namibia
USA
South part 2014
Year of
2009
2010
Year of
West part 2016
Commissioning
Commissioning
(Scheduled)
400
300 MW,
MW
Power Rating
±170
SouthMVAr
part:
Power Rating
2×600
MW
DC
350 kV
DC Voltage
Voltage
±200
kV
DC Voltage
±300 kV
Remarkable:
Remarkable:
Connection
two weak
Remarkable:
The first project
using system
MMC via long
overhead
lines
The
first multi-terminal
VSC HVDC
system
http://www.automation.com
http://www.siemens.com
http://www.svk.se
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
4
Electric Power Engineering
Potential Applications
•
•
•
•
Multi-terminal VSC-HVDC
Hybrid System of CSC and
VSC
Segmentation of AC Grid
Meshed DC grid
2.
1.H.B.
X.
R.Clark,
Lie,
daAndersen
Silva,
B.
Williams,
Teodorescu,
and
Y.
andLiangzhong,
P. Rodriguez,
"Multi4.
3.
R.
A.W.
A.R.
Edris,
and X.
M.Lie,
El-Gasseir,
"Hybrid
K.
HVDC
Epp, system
A."Power
Isaacs,
for
terminal
delivery
DC
in multiterminal
transmission
VSC-HVDC
systems
for connecting
transmission
and
power
D. Woodford,
transmission
"Softening
to island
networks"
the Blow
of
(inDisturbances"
Proc. large
offshore
systemand
for
wind
offshore
farms"
wind
(in Proc.
power
Power
applications"
and6,Energy
(in
Society
Proc.
(Power
Transmission
Energy
and
Distribution
Magazine,
IEEE,
Conference
vol.
and
2008,
Exposition,
pages
General
Innovative
Meeting
Smart2003,
- Grid
Conversion
Technologies
and Delivery
Conference
of Electrical
Europe
30-41).
2003
IEEE
PES,
pages.
55-60
Vol.1).
Energy
(ISGT Europe),
in the 21st
2010
Century,
IEEE 2008
PES, IEEE,
2010, pages.
2008, pages.
1-8) 1-7).
1 2
43VSC-HVDC
Integration
Hybrid
application
Wind
farms
using
CSC
Multi-termianl
and
VSC-HVDC
VSC-HVDC
Supplying
power
Segmentation
to of
urban
load
ofcenter
acofgrid
using
using
Multi-termianl
VSC-HVDC
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
5
Electric Power Engineering
Summary from Literature Review
The most important aspects concerning this technology include:
•
•
•
•
Applications of MMC in HVDC
New modelling and control methods of VSC
Future applications of VSC will be multi-terminal VSC HVDC
and/or DC grid
Research studies on operations of mixed DC and AC grid at
the system level will be more demanding.
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
6
Electric Power Engineering
Example Results
S1 Sv
450
90
P = -301.4
Q = -0.06018
V
F
Ph V = 367.3
0.0001 [H]
A
V
VSC1 : Controls
S1_Udcfil
S1_Pdc
VSC2 : Controls
S2_Udcfil
S2_Pdc
599.989
594.573
296.333
323.071
0.0291 ohm/km X 200 km
VSC1
VSC2
5.82 [ohm]
VSC1 : Controls
VSC...
S1 Qref
S1 Udcref S1 Udc/PCtrl
700
700
700
-90
45
-700
-700
-700
0
50
0
0
600
P = -328.2
Q = -0.0599
F
V
V = 367.3 Ph
0.0001 [H]
A
V
5.82 [ohm]
2.91 [ohm]
2.91 [ohm]
VSC3 : Controls
S3 Udcfil
S3 Pdc
VSC3
588.539
Udc
P
Hz
kV
0
367
S1 Pref
55
Degree
Three-terminal VSC-HVDC model
(preliminary) in PSCAD/EMTDC
Main : ACsource
S1 Sph
S1 Sf
0.0291 ohm/km X 100 km
P = 600
Q = -0.03626
F
V
V = 367.3 Ph
0.0001 [H]
A
V
-609.395
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
7
1
Electric Power Engineering
Further work
•
Steady state study
• Joint AC and DC load flow calculation
• Optimal operation study in steady state condition
•
Dynamic study
• VSC model simplification for dynamic studies in the system level
• Multi-terminal VSC-HVDC system development using simplified
VSC model in the system dynamic study platform
• Interaction study between AC and DC system
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
8
Electric Power Engineering
Questions or
comments?
Thank you !
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
9
Electric Power Engineering
Contact Information
Wang Feng
Electric Power Engineering
Energy and Environment Department
Chalmers University of Technology
SE-412 96 Gothenburg, Sweden
+46 73 658 6258
feng.wang@chalmers.se
http://www.chalmers.se
http://www.chalmers.se/ee/EN/research/research-divisions/epe
Operational Planning of Electric Power System with Multi-terminal VSC-HVDC
F. Wang
Dec. 02, 2011
10